CN112497674A - Method for eliminating bubble floating defect on surface of micro-foaming product - Google Patents
Method for eliminating bubble floating defect on surface of micro-foaming product Download PDFInfo
- Publication number
- CN112497674A CN112497674A CN202011504953.3A CN202011504953A CN112497674A CN 112497674 A CN112497674 A CN 112497674A CN 202011504953 A CN202011504953 A CN 202011504953A CN 112497674 A CN112497674 A CN 112497674A
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- China
- Prior art keywords
- injection mold
- mold
- micro
- designing
- injection
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- Pending
Links
- 238000005187 foaming Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000007547 defect Effects 0.000 title claims abstract description 15
- 238000007667 floating Methods 0.000 title claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 34
- 239000007924 injection Substances 0.000 claims abstract description 34
- 238000001746 injection moulding Methods 0.000 claims abstract description 14
- 239000002826 coolant Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000005273 aeration Methods 0.000 claims description 4
- LPUQAYUQRXPFSQ-DFWYDOINSA-M monosodium L-glutamate Chemical compound [Na+].[O-]C(=O)[C@@H](N)CCC(O)=O LPUQAYUQRXPFSQ-DFWYDOINSA-M 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 229940079781 sodium cocoyl glutamate Drugs 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000012778 molding material Substances 0.000 claims description 3
- 239000012768 molten material Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000003908 quality control method Methods 0.000 abstract description 2
- 238000013012 foaming technology Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002609 medium Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to a quality control technology of a micro-foaming injection molding product, which is mainly used for eliminating the defect of bubble floating on the surface of the micro-foaming product. The technology carries out system design from the aspects of an exhaust structure, pouring gate arrangement, a cooling medium, process parameters and the like of an injection mold respectively, provides a defect control method aiming at the characteristics of a micro-foaming technology, and eliminates the common bubble floating defect of a micro-foaming injection molding product by applying the technology.
Description
Technical Field
The invention relates to a quality control technology of a micro-foaming injection molding product, which is mainly used for eliminating the defect of bubble floating on the surface of the micro-foaming injection molding product.
Technical Field
In recent years, automobile production and marketing are always in the front of the world in China, and with the development requirements of automobile modernization, a lightweight technology is widely applied to automobile products, wherein a micro-foaming injection molding technology is one of hot application directions.
The technology also has a lot of defects in practical application, from the characteristics of micro-foaming injection molding, the technology is faster than the traditional process speed due to the expansion of internal gas in the molding process, the melt filling speed is very easy to form the trapping problem in the injection molding cavity, meanwhile, the internal expanding gas also can expand and overflow in the filling process, and the very typical problem is the defect that bubbles float on the surface of a product easily after the product is demolded, and the bubble floats easily in batches, so that the stability of the manufacturing process is very poor.
Disclosure of Invention
Aiming at the problems, the invention provides a method for eliminating the bubble floating defect on the surface of a micro-foaming product.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: the system design is carried out by combining the micro-foaming injection mold and the manufacturing process, and the parameterized design scheme is provided for the aspects of the injection mold exhaust structure, the sprue arrangement, the cooling medium, the process parameters and the like.
A method for eliminating bubble floating defects on the surface of a micro-foaming product is characterized by comprising the following steps:
1. designing an exhaust structure of the injection mold:
one exhaust insert pin with the diameter of 4mm is designed in each 10 square centimeter area inside the core of the injection mold, and the unilateral exhaust gap is 0.03 mm; designing an exhaust structure with the length of 50mm and the depth of 0.3mm every 100mm along the parting surface of the injection mold, wherein the structural material is embedded and processed by adopting breathable steel;
2. designing a pouring gate of the injection mold:
the injection mold adopts a hot runner and needle valve type gate design, and the gate space of the injection mold is designed according to 80 percent of the flow length ratio of the processed resin;
3. designing a cooling medium of the injection mold:
on the basis of a conventional aqueous solution, 20% of polyethylene glycol in mass fraction and 0.5% of sodium cocoyl glutamate in mass fraction are added as a cooling circulating medium of the injection mold;
4. designing injection molding process parameters:
the moving mold and the fixed mold of the injection mold are controlled by a mold temperature controller, and the temperature is designed to be 5-0 ℃ below zero. In the pre-molding stage, the aeration quantity of the molten material and the mass fraction of the injection molding material are optimally controlled within the range of 0.2-0.25%, and the cooling time is 25-30 seconds.
The application of the invention shows that the method eliminates the defect of bubble floating on the surface of the micro-foaming product.
Drawings
FIG. 1 shows a comparison of the rejection rates before and after the application of the method of the present application.
Detailed Description
For better understanding of the present invention, the following technical solutions will be further described with reference to specific embodiments:
1. designing an exhaust structure of the injection mold:
one exhaust insert pin with the diameter of 4mm is designed in each 10 square centimeter area inside the core of the injection mold, and the unilateral exhaust gap is 0.03 mm; designing an exhaust structure with the length of 50mm and the depth of 0.3mm every 100mm along the parting surface of the injection mold, wherein the structural material is embedded and processed by adopting breathable steel;
2. designing a pouring gate of the injection mold:
the injection mold adopts a hot runner and needle valve type gate design, and the gate space of the injection mold is designed according to 80 percent of the flow length ratio of the processed resin;
3. designing a cooling medium of the injection mold:
on the basis of a conventional aqueous solution, 20% of polyethylene glycol in mass fraction and 0.5% of sodium cocoyl glutamate in mass fraction are added as a cooling circulating medium of the injection mold;
4. designing injection molding process parameters:
the moving mold and the fixed mold of the injection mold are controlled by a mold temperature controller, and the temperature is designed to be 5-0 ℃ below zero. In the pre-molding stage, the aeration quantity of the molten material and the mass fraction of the injection molding material are optimally controlled within the range of 0.2-0.25%, and the cooling time is 25-30 seconds.
The above scheme is designed mainly based on the following considerations:
1. the exhaust capacity of the mold is improved, the technical characteristics of micro-foaming molding are combined, the exhaust size of the traditional parting surface is optimized, and the construction of a three-dimensional exhaust network is facilitated by embedding the air-permeable steel on the parting surface. Considering the complexity of melt flowing and converging in the mold cavity, the exhaust insert pin with a proper proportion is added in the mold core, and the method can effectively enhance the exhaust area of the mold and reduce the exhaust pressure of the parting surface terminal.
2. The cooling capacity of the injection mold is improved, 20 mass percent of polyethylene glycol and 0.5 mass percent of sodium cocoyl glutamate are added to serve as cooling circulating media of the mold on the basis of conventional water-cooling media, the surface temperature of the mold is reduced, compared with the traditional aqueous medium, the medium formula cannot generate mold waterway corrosion, and the cooling capacity of the mold is stable and durable. The design of the gate spacing of the injection mold with reference to 80% of the processed resin flow length ratio is to reduce the single gate feeding time and avoid the mold overheating phenomenon caused by continuous hot fluid impact in the gate area.
3. Reasonable injection molding process parameter design, which focuses on balancing the air inflation amount and cooling process
The matching of the parameters and the practice show that when the mold temperature is minus 5 ℃ to 0 ℃, the melt aeration quantity is between 0.2 percent and 0.25 percent, and the cooling time is between 25 and 30 seconds, the micro-foaming product can well control the quality defects and has better weight reduction effect.
The invention provides a defect control method aiming at the technical characteristics of micro-foaming by system design on the aspects of an exhaust structure, a pouring gate arrangement, a cooling medium, process parameters and the like of an injection mold. As shown in fig. 1, the bubble rising defect common to the micro-foamed injection molded article is eliminated by the application of this technique.
Claims (1)
1. A method for eliminating bubble floating defects on the surface of a micro-foaming product is characterized by comprising the following steps:
firstly, designing an exhaust structure of an injection mold:
one exhaust insert pin with the diameter of 4mm is designed in each 10 square centimeter area inside the core of the injection mold, and the unilateral exhaust gap is 0.03 mm; designing an exhaust structure with the length of 50mm and the depth of 0.3mm every 100mm along the parting surface of the injection mold, wherein the structural material is embedded and processed by adopting breathable steel;
designing a pouring gate of the injection mold:
the injection mold adopts a hot runner and needle valve type gate design, and the gate space of the injection mold is designed according to 80 percent of the flow length ratio of the processed resin;
designing a cooling medium of the injection mold:
on the basis of a conventional aqueous solution, 20% of polyethylene glycol in mass fraction and 0.5% of sodium cocoyl glutamate in mass fraction are added as a cooling circulating medium of the injection mold;
designing injection molding process parameters:
the moving mold and the fixed mold of the injection mold are controlled by a mold temperature controller, and the temperature is designed to be 5-0 ℃ below zero. In the pre-molding stage, the aeration quantity of the molten material and the mass fraction of the injection molding material are controlled within the range of 0.2-0.25%, and the cooling time is 25-30 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504953.3A CN112497674A (en) | 2020-12-18 | 2020-12-18 | Method for eliminating bubble floating defect on surface of micro-foaming product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504953.3A CN112497674A (en) | 2020-12-18 | 2020-12-18 | Method for eliminating bubble floating defect on surface of micro-foaming product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112497674A true CN112497674A (en) | 2021-03-16 |
Family
ID=74922342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011504953.3A Pending CN112497674A (en) | 2020-12-18 | 2020-12-18 | Method for eliminating bubble floating defect on surface of micro-foaming product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112497674A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107877792A (en) * | 2017-12-07 | 2018-04-06 | 浙江凯华模具有限公司 | Fretting map exhaust structure of injection mold |
-
2020
- 2020-12-18 CN CN202011504953.3A patent/CN112497674A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107877792A (en) * | 2017-12-07 | 2018-04-06 | 浙江凯华模具有限公司 | Fretting map exhaust structure of injection mold |
Non-Patent Citations (3)
| Title |
|---|
| 何文: "《注塑模具设计实例详解》", 31 October 2009 * |
| 许红伍: "《塑料模具设计简明教程》", 31 August 2017 * |
| 黄玉媛: "《精细化工配方研究与产品配制技术 上》", 30 June 2003 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20210316 |